American telegraphy and encyclopedia of the telegraph : systems, apparatus, operation, embracing electrical testing ; primary and storage batteries ; dynamo machines ; Morse, duplex, quadruplex, multiplex, submarine, automatic, and wireless telegraphy ; burglar-alarm, fire-alarm, and police-alarm telegraphy ; printing telegraphy ; military and naval signaling ; railway block systems ; telegraph wires, cables, and conduits ; etc.

by

Maver, William, jr